Analysis on Functions of ±800kV Yun-Guang Ultra High Voltage DC Control System

Aiming at complicated functions of ±800 kV Yun-Guang ultra high voltage DC control system and its difference in setting control elements from conventional DC transmission projects,the paper introduces and analyzes setting of each control element of the control system,such as controller choosing,inter-substation current control and coordination,current margin compensation,current error control,low voltage current limiting and transient fault recovery as well as setting of special control elements,such as voltage balancing control unit,leakage current judgement,which significantly guides protection configuration choice in system operation and field commissioning of ultra high voltage DC projects.